Articles
ROTYLENCHULUS RENIFORMIS DAMAGE THRESHOLDS ON PINEAPPLE
Article number
529_29
Pages
239 – 246
Language
Abstract
Implementation of environmentally sound and sustainable plant-parasitic nematode management depends upon accurate assessment of population densities and knowledge of damage thresholds.
A field experiment was established to determine the damage threshold for Rotylenchulus reniformis on pineapple.
Twenty-five 2 bed wide x 10 m long plots were selected representing preplant population density ranges of 0–10, 40–70, 100–120, 300–310, and 1020–1360 nematodes/250 cm3 soil.
Each range contained five plots with 100 plants.
Soil was assayed for fertility at planting.
D-leaf weight, plant height, and root biomass were recorded 6 and 12 months after planting.
Fruits were harvested and weighed.
D-leaf weight, plant height, and root biomass did not differ (P > 0.05) among the population ranges at 6 or 12 months.
Average fruit weight was greatest in the 300–310 range plots and lowest in the 0–10 range plots (1.2 vs. 1.1 kg, respectively). Fruit weight increased with increasing nematode population densities up to the 300–310 range but decreased at the 1020–1360 population range (P = 0.01). Soil phosphorus and potassium levels did not correlate with fruit yield.
Average fruit weight increased as soil calcium, magnesium, and soil aggregate size increased except at the 1020–1360 nematode population density.
Preplant populations of R. reniformis below 300 nematodes/250 cm3 soil damage pineapple but are not the major factor limiting yield.
Pineapple yield may be moderated by limited soil fertility and physical soil factors. R. reniformis becomes the major limiting soil factor at population densities above 1000 nematodes/250 cm3 soil.
Nematode damage to pineapple may be moderated with attention to soil fertility and delayed forced flowering.
A field experiment was established to determine the damage threshold for Rotylenchulus reniformis on pineapple.
Twenty-five 2 bed wide x 10 m long plots were selected representing preplant population density ranges of 0–10, 40–70, 100–120, 300–310, and 1020–1360 nematodes/250 cm3 soil.
Each range contained five plots with 100 plants.
Soil was assayed for fertility at planting.
D-leaf weight, plant height, and root biomass were recorded 6 and 12 months after planting.
Fruits were harvested and weighed.
D-leaf weight, plant height, and root biomass did not differ (P > 0.05) among the population ranges at 6 or 12 months.
Average fruit weight was greatest in the 300–310 range plots and lowest in the 0–10 range plots (1.2 vs. 1.1 kg, respectively). Fruit weight increased with increasing nematode population densities up to the 300–310 range but decreased at the 1020–1360 population range (P = 0.01). Soil phosphorus and potassium levels did not correlate with fruit yield.
Average fruit weight increased as soil calcium, magnesium, and soil aggregate size increased except at the 1020–1360 nematode population density.
Preplant populations of R. reniformis below 300 nematodes/250 cm3 soil damage pineapple but are not the major factor limiting yield.
Pineapple yield may be moderated by limited soil fertility and physical soil factors. R. reniformis becomes the major limiting soil factor at population densities above 1000 nematodes/250 cm3 soil.
Nematode damage to pineapple may be moderated with attention to soil fertility and delayed forced flowering.
Publication
Authors
B.S. Sipes, D.P. Schmitt
Keywords
Rotylenchulus reniformis, damage, pineapple, nematode
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